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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >An in situ SERS study of substrate-dependent surface plasmon induced aromatic nitration
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An in situ SERS study of substrate-dependent surface plasmon induced aromatic nitration

机译：底物依赖性表面等离激元诱导的芳族硝化的原位SERS研究

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摘要

Here we demonstrate the surface plasmon (SP) induced nitration of aromatic rings by an in situ surface enhanced Raman spectroscopy (SERS) technique. The size feature of the as-prepared Au, Ag and Ag@PDA@Au hierarchical structures allows monitoring the entire reaction process on a single hierarchical structure. With benzenethiol (BT) and HNO3 as reactants, SP induced aromatic nitration can be successfully realized without the assistance of a conventional acid catalyst, H2SO4. Experimental and theoretical studies confirm that the nitration reaction leads to para-nitrothiophenol (p-NTP). While control experiments show that SP here functions as a local heating source and the presence of metal is also necessary for this nitration reaction. This SP induced aromatic nitration reaction also displays SERS substrate-dependent reaction kinetics, which proceeds more rapidly on the Au surface. Higher laser power can generate a stronger photothermal effect, and thus an accelerated reaction rate for this reaction. We believe this finding may broaden the research areas in the SP assisted or induced catalytic reactions.
机译：在这里，我们通过原位表面增强拉曼光谱（SERS）技术展示了表面等离子体激元（SP）诱导的芳香环硝化。所制备的Au，Ag和Ag @ PDA @ Au分层结构的尺寸特征允许在单个分层结构上监视整个反应过程。使用苯硫醇（BT）和HNO3作为反应物，无需常规酸催化剂H2SO4即可成功实现SP诱导的芳族硝化反应。实验和理论研究证实硝化反应可导致对硝基硫酚（p-NTP）。尽管对照实验表明，SP在这里起局部加热源的作用，但对于硝化反应来说，金属的存在也是必需的。该SP诱导的芳族硝化反应还显示了SERS底物依赖性反应动力学，该动力学在Au表面上进行得更快。较高的激光功率可以产生较强的光热效应，因此可以加快该反应的反应速度。我们相信这一发现可能会拓宽SP辅助或诱导的催化反应的研究领域。

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